Follow these steps in order to change your password:
Click on My Account in the lower left.
Click My Account again.
On the Account Details tab at the top, click the Change Password button.
Provide the current password you have logged in with, and then provide the new password. Follow the guidelines to make sure the password has the proper security.
Re-enter the password in the Confirm Password text box.
If the Password and New Password entries match, then you can click Update to change your password.